Some concerns come to mind when you are discussing higher than HD. In your message you say your are using a Nitris DX appliance. The DX appliance will never exceed 10 bit or HD on output, it is a limitation of the hardware. Monitoring through that output is going to be a down convert. It is my understanding that many of the higher than HD formats actually use higher than 10 bit per pixel depth. In the Wiki page on DNx HR, it mentions that HQX and 444 both use 12 bit sampling, as one baseline comparison. High end 4K/UHD workflows usually use file formats that are 16 bit (DPX or Open EXR), which is a difficulty when delivering such formats.
On the subject of AVID render bit depth, please look to Media Creation (render tab) settings. I always de-select same as source, as this often causes the AVID to default to lower bit depths of rendering, when you might have most of your media at higher quality, and a stray clip at a low quality. Additionally, you can set 8 bit, auto or 16 bit for render quality. For online work I always force to 16 bit render quality.
And finally, using the GUI for any quality assessment is questionable on many grounds, because of the limitations of monitors and graphics card settings. Mac OS doesn't even tell you anymore what quality the display is running without drilling down to a full system report, and doesn't use typical encoding schemes we are use to using in television/film formats. 32 bit color? What kind of dithered mess is that? And can the monitor you are connecting to (except in the case of high end HP Dreamcolor or possibly the Mac Thunderbolt display) even display at that quality? This also doesn't take into account how AVID actually processes and delivers the video itself to the GUI, especially when it isn't full screen.
I see the need to have a proper i/o that supports the resolution and bit depth you are working in, before you can make any real assessments, and would love to hear from any AVID engineers lurking here, to get an accurate assessment. Are you planning to support these higher bit depths in DPX? Are you planning to support other high end formats like Open EXR? What actual quality levels are you showing in the GUI? How about quality levels when playing out in Full Screen mode?
Dave Hogan,
Burbank, CA
On Saturday, August 27, 2016 8:03 PM, "bigfish@pacbell.net [Avid-L2]" <Avid-L2@yahoogroups.com> wrote:
You make a valid point. What I'm really concerned about is if timeline quality settings have any effect on 8 vs 10 bit rendering. Normally I will set media creations settings to DNX175X for rendering codec and don't let it be same as souce. However in this 4K project I've set the render to ProResHQ which isn't specific to bit depth. Or is it? My understanding is ProResHQ is 220mbs like DNX220 in 29.97 but that doesn't tell me it's bit depth. If my timeline quality isn't 10bit would a render be ProResHQ 8 bit?
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Posted by: Dave Hogan <mactvman@yahoo.com>
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